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Precision 1Hz clock Generator using Chip-On-Board

EFY Bureau
Usually the circuits for generation of 1Hz clock for applications in digital clock and counter circuits make use of ICs in conjunction with a...

Friendly Charger for Mobile Phones

Correspondent #6 EFY News Network
Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of...

MOSFET based Preamplifier for FM Radio DXing

EFY Bureau
FM transmissions can be received within a range of 40 km. If you are in fringe areas, you may get a very weak signal....

Pencell Charge Indicator

EFY Bureau
Small-size AA cells and button cells used in electronic devices providing a terminal voltage of 1.5V are normally rated at 500 mAh. As the...

Audio Amplifier for Personal Stereo

EFY Bureau
In the output stages of most broadcast receivers and some amplifiers, there is a limit up to which maximum power can be developed without...

Telephone Line Based Audio Muting and Light-on Circuit

EFY Bureau
Very often when enjoying music or watching TV at high audio level, we may not be able to hear a telephone ring and thus...

Low-Cost PCO Billing Meter

Correspondent #6 EFY News Network
The circuit presented here can be used in PCOs for displaying the actual bill. The comparative disadvantages of the presented circuit are as follows: 1....
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